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## MC13110A Datasheet(PDF) 24 Page - Motorola, Inc

 Part # MC13110A Description UNIVERSAL CORDLESS TELEPHONE SUBSYSTEM IC Download 68 Pages Scroll/Zoom 100% Manufacturer MOTOROLA [Motorola, Inc] Direct Link http://www.freescale.com Logo

## MC13110A Datasheet(HTML) 24 Page - Motorola, Inc

 24 / 68 pageMC13110A/B MC13111A/B24MOTOROLA ANALOG IC DEVICE DATAFirst Local OscillatorThe 1st LO is a multi–vibrator oscillator. The tank circuit iscomposed of a parallel external capacitance and inductance,internal programmable capacitor matrix, and internalvaractor. The local oscillator requires a voltage controlledinput to the internal varactor and an external loop filter drivenby on–board phase–lock control loop (PLL). The 1st LOinternal component values have a tolerance of±15%. Atypical dc bias level on the LO Input and LO Output is 0.45Vdc. The temperature coefficient of the varactor is+0.08%/°C. The curve in Figure 33 is the varactor controlvoltage range as it relates to varactor capacitance. Itrepresents the expected internal capacitance for a givencontrol voltage (VcapCtrl) of the MC13110A/B andMC13111A/B. Figure 32 shows a representative schematic ofthe first LO function.LO1 InLO1 OutVcap CtrlProgrammableInternalCapacitor1st LOVaractorVaractorCextLextFigure 32. First Local Oscillator SchematicTo select the proper Lext and Cext we can do the followinganalysis. From Figure 34 it is observed that an inductor willhave a significant affect on first LO performance, especiallyover frequency. The overall minimum Q required for first LOto function as it relates to the LO frequency is also given inFigure 34.Choose an inductor value, say 470 nH. From Figure 34,the minimum operating Q is approximately 25. From thefollowing equation:Q Coil = Rp/X Coilwhere: Rp = parallel equivalent impedance (Figure 35).Cext can be determined as follows:fLO +12p LextCextwhere: Lext = external inductance, Cext = externalcapacitance.Figure 34 clearly indicates that for lower coil values, higherquality factors (Q) are required for the first LO to functionproperly. Also, lower LO frequencies need higher Q’s. InFigure 35 the internal programmable capacitor selectionrelative to the first LO frequency and the parallel impedanceis shown. This information will help the user to decide whatinductor (Lext) to choose for best performance in terms of Q.Refer to the Auxiliary Register in the Serial InterfaceSection for further discussion on LO programmability.

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